This is When Haidh Commences

1. When blood comes onto the skin of the outer private part then only haidh commences.
2. It does not matter whether it flows or not from the skin.
3. If a woman puts a piece of cotton in the vagina so that blood does not come out, then as long as the blood remains inside and no spot of blood is visible on the outer part of the cotton, haidh does not come into effect.
4. When the blood is visible on the outer private part, or the blood-stained cotton is removed then only haidh commences.
5. A woman in a clean state placed a pad at night. When she woke up, she noticed a spot of blood. Her haidh commences from the time she saw the stain.

(Behshti Zewar)